Creating a Hostile Work Environment

There must be a national urine shortage. How else can we explain that people so willingly accept drug testing when supposedly only 6 percent or so of the population are actually past month drug users? By definition 94 percent of the people are not using drugs, so why are they all suspects? Also, if drug users can only be detected through urinalysis, what sort of "problems" can they actually be causing? The rates of workplace injuries and fatalities have been declining for decades while, drug use has remained steady and/or risen over most of the same time period.